The retweet is the latest in what the groups say is a string of racist comments and actions involving the Alameda County Sheriff's Office, including Sheriff Greg Ahern's signing of a letter on behalf of the California State Sheriffs' Association endorsing Jeff Session's nomination as U.S. attorney general.

On Tuesday, Alameda County sheriff's spokesman Sgt. Ray Kelly apologized for the retweet of the prominent white supremacist and said it was accidental.

Kelly said he was researching Spencer because he is a "focal point" of a right-wing rally planned in Berkeley on Aug. 27. He even requested the Sheriff's Office IT department to help him delete the retweet.

Before the retweet incident, protest organizers planned a demonstration calling Alameda County Sheriff Greg Ahern to task for his past support of United States Attorney General Jeff Sessions.

"What kind of correspondence has the Sheriff's Department been having with the Trump administration?" asked Jon Rodney with the California Immigrant Policy Center. "And with anti-immigrant forces. So we want to uncover the truth."